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The Oak Tree Fire burning near Sonoita was not extremely active overnight, giving wildland crews a chance to establish a more secure fire line around the perimeter of the blaze, according to Heidi Schewel, a spokeswoman for fire administrators.

The fire was estimated to be about 2,000 acres and 20 percent contained as it burned in grass, oak, pine and juniper. A reconnaissance flight scheduled for Thursday morning was expected to give firefighters a better sense of the blaze's size and the strength of the containment lines, Schewel said.

The fire was first reported Wednesday afternoon and investigators believe it might have been human caused.

An additional 10 engines arrived Thursday morning to assist with the fight, along with two more 20-person hand crews, Schewel said.

Firefighters were expected to continue working on the northern and eastern edges of the fire on Thursday, where they were planning to shore up containment lines, Schewel said.

The lines crews put in place on Wednesday were good but not solid, she said, in part because pockets of vegetation could allow the blaze to spread beyond the lines in those areas.

The fire, which is burning about 10 miles north of Sonoita, was said to be about three miles from the closest structures -- out buildings on a ranch in the area -- and it was continuing to smolder east of State Route 83 and north of the Empire Ranch, Schewel said.

The blaze has not affected the grapes that vineyards and wineries in the area rely on, Schewel said.